【摘 要】
：
In this paper,we demonstrate that controlled dopant-concentration is an essential issue for charge carriers transporting in red Phosphorescent Organic Light-Emi
【机 构】
：
College of Computer Science and Technology,State Key Laboratory on Integrated Optoelectronics
【基金项目】
：
the Research Fund for the Doctoral Program of Higher Education;the Scientific and Technological Developing Scheme of Jilin Province;国家自然科学基金;the Ministry of Science and Technology of China;the Nationa
论文部分内容阅读
In this paper,we demonstrate that controlled dopant-concentration is an essential issue for charge carriers transporting in red Phosphorescent Organic Light-Emitting Device (PHOLED).Carriers transport via dopant molecules in the emitting layer with a single host,however,via both dopant and host molecules when their energy levels are well aligned.Conditions for reduced driving-voltage and enhanced efficiency of red PHOLED are obtained by employing a mixed host structure.A pure red PHOLED with color coordinates of (0.67,0.33) has been realized by using only 4 wt％ dopant,The device achieves 100 cd/cm2 at 2.9 V,with corresponding power efficiency of 9.3 lm/W and external quantum efficiency of 14.3％.
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